check string has balenced parenthesis

parenthesis.js

var stack = [];

var Check = {
  isOpen: (str) => ['{', '(', ']'].includes(str),

  isClosed: (str) => ['}', ')', ']'].includes(str), 

  checkClosed: (i, j) =>  (i == '(' && j == ')') || (i == '{' && j == '}') || (i == '[' && j == ']'),
  
  test: function(str) {
    let unb = false;
    str.split('').forEach((s) => {
     if(this.isOpen(s)) {
         stack.push(s);         
     } else if(this.isClosed(s)) {
        let k = stack.pop();
        unb = this.checkClosed(k, s);
     }
    });
    return unb;
  }
}

var Parenthesis = {
 validParentheses: function(data) {
    let brackets = '()[]{}'
    let Stack = [];
    
    data.split('').forEach(v => {
      let bracePosition = brackets.indexOf(v);

      if(bracePosition % 2 == 0) {
        // if its an opening brace, push the close brace on stack;
        Stack.push(bracePosition + 1);
      } else {
        // check if the closing brace being matched is the one on the top
        if(!(Stack.length !== 0 && Stack.pop() === bracePosition)) throw new Error("unbalanced");
      }
    });
  }
}